December 11, 2023

The Minnesota Department of Agriculture (MDA) has confirmed emerald ash borer (EAB) in Morrison County for the first time. There are now 46 counties in the state, including Morrison, with EAB.

A suspected EAB infestation was reported at a campground in Genola, MN. EAB larvae was later found, and samples were collected by MDA staff. Federal identification confirmed the samples as emerald ash borer. MDA staff also surveyed other areas in Morrison County and found EAB near Little Falls, MN.

EAB was first discovered in Minnesota in 2009. The insect larvae kill ash trees by tunneling under the bark and feeding on the part of the tree that moves nutrients up and down the trunk. Often, the trees show several signs of infestation because of this. Woodpeckers like to feed on EAB larvae, and woodpecker holes may indicate the presence of emerald ash borer. Also, EAB tunneling can cause the bark to split open, revealing characteristic S-shaped galleries underneath.

Because this is the first time EAB has been identified in Morrison County, the MDA is enacting an emergency quarantine of the county. The quarantine limits the movement of firewood and ash material out of the area.

The MDA issues quarantines for all areas known to have EAB to reduce the risk of further spreading the tree-killing insect.

A virtual informational meeting for residents and tree care professionals in Morrison County will be held on Wednesday, December 13, 2023, from 10 a.m. – 11 a.m. Experts from the MDA will give a brief presentation followed by a question-and-answer session.

Emerald Ash Borer Virtual Informational Meeting:
December 13, 2023
10 a.m. – 11 a.m.
Register at

The public will also have an opportunity to provide input on the proposal to add Morrison County’s emergency quarantine to the state’s formal quarantine. The MDA is taking comments on the proposed formal quarantine now through January 16, 2024, and recommends adopting the quarantine on January 19, 2024. The proposed quarantine language can be found at

Comments can be made during the virtual meeting or by contacting:

Kimberly Thielen Cremers
Minnesota Department of Agriculture
625 Robert Street North
St. Paul, MN 55155

There is more EAB information on the MDA website.


Media Contact
Brittany Raveill, MDA Communications